The headwaters of the river are at Metolius Springs, where the river emerges from two clusters of springs at the base of Black Butte. Water flows to these springs from the drainage basin around Black Butte Ranch, several miles to the south. The elevation of the drainage basin is above that of the springs, forming a natural standpipe that tends to stabilize the river's rate of flow. As a consequence, the water level in the Metolius River is relatively constant. The rate of flow at the headwaters is approximately or 50,000 gallons per minute), although it grows by an additional or 600,000 gallons per minute) by the time the river reaches Lake Billy Chinook. Similarly, the water temperature is also stable; at the river source, the water temperature is a consistent.
The Metolius River supports a broad cross-section of the wildlife present in the Central Oregon region. The river itself is home to several fish species, including rainbow trout, bull trout, kokanee salmon and mountain whitefish. Larger animals including river otters and beaver inhabit the areas in and immediately around the river, and larger land mammals, including mule deer, elk, black bear, and cougar range in the surrounding area. Migratory waterbirds such as the mallard and the Canada goose are common in the spring and summer, as are raptors such as the osprey and the red-tailed hawk. The white-headed woodpecker, generally rare and of interest to many birders, is quite common in several areas along the river.
Recreation
Sport fishing for rainbow trout and bull trout is fly-fishing only on the upper Metolius—and catch-and-release, with barbless hooks. A number of small resorts and shops cater to fishermen and other visitors, principally in the community of Camp Sherman. Hiking and horseback riding are popular activities in the area, particularly on the upper, southern portion of the river, with trails extending up and down the river and into the forests on both sides. There are also a number of developed campgrounds on the banks of the river. Fishing, rafting, hunting and cross-country skiing are all popular seasonal activities. The Wizard Falls Fish Hatchery is about north of the headwaters. This hatchery raises rainbow trout, kokanee, and salmon. The hatchery is open to visitors, with various species of trout and other fish on display in ponds.
Coordinates
Coordinates from GNIS list one point per 7.5 minute map. The source and mouth are not repeated here.